select id from documents 
where language='en' and pubdate >= '2011-05-01' 
and source_id not in (8791, 1632, 1, 1676, 8793)
;

select id from documents 
where language='de' and pubdate >= '2011-05-01' 
and source_id not in (8792, 1645, 1635, 1672)
;